The Monoyer chart and what 10/10 does not tell you

Dr Moïse Tourabaly · Key points

The Monoyer chart and what 10/10 does not tell you

In France, distance vision is measured at 5 metres on the Monoyer chart, graded from 1/10 to 10/10. Reading the 10/10 line corresponds to visual acuity considered normal.

Z1/10

UF2/10

NRT3/10

DHVZ4/10

EXOCL5/10

FUNTRD6/10

HZVEOXC7/10

LDTFUNR8/10

ZHEVOXCL9/10

TDNURFHZ10/10

What 10/10 does not tell you

contrast sensitivity
night vision
the extent of the visual field
colour vision
the health of the back of the eye

10/10 is a threshold of normality, not a maximum: some people can read beyond it. Its English-language equivalent is 20/20, on the Snellen chart.

Illustration: letters and sizes are indicative. The measurement is taken at the practice, at 5 metres, with a standardised chart and lighting; this image does not replace that test.

Educational diagram · Dr Moïse Tourabaly, ophthalmologist. It does not replace a consultation.